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Finding the Fourth Proportional to 385.50, 530.90 and 360.79

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Solution

The fourth proportional to 385.50, 530.90 and 360.79 is: 496.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.50 : 530.90 = 360.79 : x
  2. Step 2: Convert to fraction form
    385.50/530.90 = 360.79/x
  3. Step 3: Cross multiply
    385.50x = 530.90 × 360.79
  4. Step 4: Simplify right side
    385.50x = 191,543.41
  5. Step 5: Solve for x
    x = 191,543.41/385.50
  6. Step 6: Final answer
    x = 496.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.